James c



thisspeciication, in whicham am i mink* JAMES c; WELLS, or WARREN,eE'NNsYLVANIA,

Letters Patent No. 95,174,-

datedSeptcmbe/r 21, 1869.

Man-

, ,IMPROVEMENT 1N nccnN'rnIfcs.

Thechedule referred 'coin these Letters'llatent and making part- 'of `tue same.

llad to the accompanying drawing, making pant of Figure f1 is a plan view ofthe eccentric, and rFigure-'2 is a sectional view through the line x y, g.11.` l y Y 4The invention relates to that 'class of eccentrics Awhichisv mounted i upon and carried by a revolving shaft, and is usually .made adjustable upon saidl rishaft, such adjustment having reference to the distance at which the lthrow of the eccentric shall either precede orofollow the crank which drives the shaft, and by means of which adjustment the desired lead may be given to the valve of a steam-engine.

"IVhe object of my invention is to enable anyone to not vonlymake the adjustment above described, but

also togchange at will thelength of the throw or travel' of the valvev by` means ofthe eccentric, instead of e'ecting it through a link, as lis frequently done 'in locomotive-engines, or by means of a slottedarrn on a rock-shaft, with whichbot-h valve and eccentric are connected. i

The construction which Iha've `invented to accomv plish the changes of movement rst described will be fully understood from 'the following description of its construction and operation. In the drawing-` 4 'A represents an eccentric wheel' of the ordinary ,form,and -is shown as being provided with a projecting hub, A', adaptedz to receive a set-screw, a., lby which the eccentric may be 'secured to the shaft, orv any other mode of .adjusting and securing to the shaft 'may be employed.` i

, B is an eccentric ring, surroundingand iitting closely eccentric A. l l

C O1 is a strap surroundingthe entire eccentric, and held in contact with it,and tightenedor loosened, as may be required, by means of bolts Ac passing through ears ck Y n 1 The part G1, of the strap, is expanded into a shank, C2, substantially as shown in the drawing, and to which is connected the eccentricrod in any usual orl well-known manner. .l

vUpon the peripheryof ring B there is a bead or rib, l, which engages'with a corresponding groove, c, upon the inner surface of strap C Gl,- serving to keep ring y B and said strap always in proper relationA to each other, which end may be also4 attained by'any other construction, if circumstances may render advisable.

The bolts D 'pass through eccentric wheel A, in perforations, made so close to .thelI edge of said 'wheel that the head of the bolt and also the nut dA shall lap over and impinge upon the inner edge of ring B, thus serving a twofold purpose; that is, Vthey keep both wheel and ring always inline with each other, and lat the same time theypvhen screwed uptightly, cause the ring torevolve simultaneouslywith thewheel.

, rBhe operation 'of my improvement is as follows: The wheel-A is rotated by a shaft passing through hub A', which is secured to the shaft in any ordinary manner, and if itis desired to give the straps (J (lI 4 Athe greatest extent-of throw which is possible todo,

I tum the ring ,arounduntil its widest'point is upon the same. side of hubA'as is the greatest diameter ofwheel A, and making the longest radial'line of said `ring form an extension of the longest radial lineof said wheel. v i

This position is indicated on the drawing by the figures upon both ring and wheel-being brought close together. V l i 1t will be readily secu thatthis arrangement will produce the desired result, inasmuch as it throws just as much ofthe eccentricy upon one side of the drivingshaftas is possible; and it is equallyv apparent that if I revelse the relative pcfsit-ionofwhcelu and ring B,-

by bringing the narrowest part ofthe wheel -A,'which is indicated by the figures around to the widest vpart of rim B, which is indicated upon its face by 71,', it will bring the hub'A as near centre of the eccentric, always regarding both wheel and ring as constituting the eccentric, Ishall havey reduced the throw to-its minimum. Y

Among the advantages gained by my peculiar ar# rangement I will mention, v

'I iiist, greatsimplicity of construction, and consequent small liability tov get out of order.

Second, entire freedom fromY elongated slots in the centre, which weaken the parts.

v Third, its adaptation to use upon a shaft of uni--` form size throughout, instead of being operated by a l crank-pin. l

` I do not claim broadly an eccentric in which the length of the'throw can be'va'red, nor one in which the. lead can be changed, these results havingbeen accomplished before, as shown iu thepatents of M. G; Wilder,` in 1864, and N. C. Stales, January 26, 1864 1861,; but having thus described the construction and'operation of my improved eccentric,

What I 'claim' as new, and desire to secure by Lctters Patent, is l 1. The combination of the-eccentric wheel A, ec lcentric ring B, strap C G, and bolts D, all arranged and operating substantially as set forth.` j

2. The combination 'of the eccentric wheel A, eccentric ring B, strap C C, bolts D, and set-screw u., operating substantially asset forth. Y

JAMES C. WELLS. Witnesses;4

T. J. WATERS, W. F. KINGsBU'nY.

as is possible to the.

and the rejected application of It. W. Drew, Vin A 

